The Price for the NSA310 is around 70EUR here in Germany (if it can be delivered) and around 135EUR for the NSA320
The NSA-320 is now at 93EUR (including Postage) here in Germany - cheaper as a Sheevaplug
but the NSA-310 is sometimes now at around 83EUR.... so I ordered a NSA-320
because of the from Zyxel
The NSA-325 does have a 1.6Ghz Marvell CPU but the Ram is like on the NSA-320 (512MB)
The NSA-325 is around 145-170EUR.